Lumbar disc protrusion 4~5mm specifically depends on the location of the protrusion, if there is no compression of the nerve does not matter, if the compression of the nerve has leg pain leg numbness and other symptoms should be taken seriously. Lumbar disc herniation 4~5mm this situation if there is no back pain leg pain leg numbness is generally not serious, some patients will have the symptoms of back pain, through bed rest, the symptoms can be reduced. If the herniation is centralized, the dural sac will be slightly compressed, and some patients will have leg pain and numbness, which can be relieved in most patients through conservative treatments, such as lumbar traction, acupuncture and physiotherapy. If the lumbar disc herniation protrudes to the side and compresses the nerve channel causing spinal stenosis, there will be leg pain and numbness on one side, and weakness in walking, etc. This situation should be taken seriously. If the conservative treatment is ineffective, you can consider performing surgical disc removal surgery. So the lumbar disc herniation 4~5 millimeters depending on the type of herniation and symptoms to see if it matters, if there is obvious back pain leg pain leg numbness timely medical treatment.